There was a mini discussion in the Electronic forum.
http://www.bikeforums.net/showthread...attery-problem
No one knows for sure yet, but it seem to be wired up in a 4P configuration. The plugs are different, so yeah, you will need to get the battery out up charge them. The lumen is downgraded possibly because of the lower voltage?
I think it will be better to get a MS and wait for Geoman and their replacement pack, however it was posted those pack will not be ready till end of April. The other choice is the Gemini Titan but that is more expensive.